/* ============================================================
   SendLK — BYOD SMS SaaS. "Transmission at night" theme.
   ============================================================ */
:root{
  --ink:#071019; --ink-2:#0a1826; --surface:#10263b; --surface-2:#143049;
  --line:rgba(140,180,210,.14); --line-2:rgba(140,180,210,.28);
  --teal:#34e0c4; --teal-deep:#12b5a0; --amber:#ffc24b;
  --text:#eaf2f8; --muted:#91a7bc; --muted-2:#6d8399;
  --radius:16px; --maxw:1140px;
  --shadow-glow:0 0 60px rgba(52,224,196,.18);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,sans-serif;
  background:var(--ink); color:var(--text);
  line-height:1.6; -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,.display{font-family:'Space Grotesk','Inter',sans-serif;line-height:1.08;letter-spacing:-.02em}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  font-weight:600;font-size:.98rem;padding:.8rem 1.5rem;border-radius:999px;
  border:1px solid transparent;cursor:pointer;transition:transform .15s ease,box-shadow .2s ease,background .2s ease}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--amber);color:#3a2600}
.btn-primary:hover{box-shadow:0 8px 30px rgba(255,194,75,.35)}
.btn-ghost{border-color:var(--line-2);color:var(--text);background:rgba(255,255,255,.02)}
.btn-ghost:hover{border-color:var(--teal);color:var(--teal)}
.btn-teal{background:var(--teal);color:#032720}
.btn-teal:hover{box-shadow:var(--shadow-glow)}
.btn-block{width:100%}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);
  background:rgba(7,16,25,.72);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:.6rem;font-family:'Space Grotesk';font-weight:700;font-size:1.15rem}
.brand-mark{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--teal),var(--teal-deep));
  display:grid;place-items:center;box-shadow:var(--shadow-glow)}
.brand-mark svg{width:17px;height:17px}
.nav-links{display:flex;align-items:center;gap:1.6rem}
.nav-links a.link{color:var(--muted);font-size:.95rem;font-weight:500}
.nav-links a.link:hover{color:var(--text)}
.nav-cta{display:flex;align-items:center;gap:.7rem}
@media(max-width:760px){.nav-links .link{display:none}}

/* ---------- hero ---------- */
.hero{position:relative;padding:clamp(3rem,8vw,7rem) 0 clamp(3rem,6vw,5rem);overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;z-index:0;
  background:
    radial-gradient(60% 50% at 78% 20%,rgba(52,224,196,.16),transparent 70%),
    radial-gradient(50% 40% at 15% 80%,rgba(18,120,160,.18),transparent 70%);
  pointer-events:none}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr .95fr;gap:3rem;align-items:center}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr;gap:2.5rem}}
.eyebrow{display:inline-flex;align-items:center;gap:.5rem;font-size:.82rem;color:var(--teal);
  background:rgba(52,224,196,.08);border:1px solid rgba(52,224,196,.25);
  padding:.35rem .8rem;border-radius:999px;font-weight:600;margin-bottom:1.4rem}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--teal);box-shadow:0 0 10px var(--teal);animation:blink 2s infinite}
@keyframes blink{50%{opacity:.3}}
.hero h1{font-size:clamp(2.3rem,5.4vw,3.8rem);font-weight:700;margin-bottom:1.2rem}
.hero h1 .soft{color:var(--muted)}
.hero p.lead{font-size:clamp(1.05rem,2vw,1.2rem);color:var(--muted);max-width:34ch;margin-bottom:2rem}
.hero-cta{display:flex;gap:.9rem;flex-wrap:wrap;margin-bottom:1.6rem}
.hero-note{font-size:.88rem;color:var(--muted-2);display:flex;align-items:center;gap:.5rem}
.hero-note svg{width:15px;height:15px;color:var(--teal)}

/* ---------- transmission scene ---------- */
.scene{position:relative;aspect-ratio:1/1;max-width:460px;margin-inline:auto;width:100%}
.scene svg{width:100%;height:100%;overflow:visible}
.pkt{fill:var(--teal);filter:drop-shadow(0 0 6px var(--teal))}
.ring{fill:none;stroke:var(--teal);stroke-width:1.5;opacity:0}
.wire{fill:none;stroke:var(--line-2);stroke-width:1.5;stroke-dasharray:4 6}
@media (prefers-reduced-motion:no-preference){
  .pkt{animation:flow 3.4s linear infinite}
  .pkt.b{animation-delay:1.1s} .pkt.c{animation-delay:2.2s}
  .ring{animation:pulse 3.4s ease-out infinite}
  .ring.b{animation-delay:1.7s}
}
@keyframes flow{
  0%{offset-distance:0%;opacity:0}
  8%{opacity:1} 88%{opacity:1}
  100%{offset-distance:100%;opacity:0}
}
@keyframes pulse{0%{opacity:.6;transform:scale(.4)}100%{opacity:0;transform:scale(1.8)}}
.node{fill:var(--surface);stroke:var(--line-2);stroke-width:1.5}
.node-lbl{fill:var(--muted);font:600 11px 'Inter';text-anchor:middle}
.phone-body{fill:var(--surface-2);stroke:var(--teal);stroke-width:2}
.phone-scr{fill:#04121b}
.bubble{fill:var(--teal);opacity:.9}
.bubble.dim{fill:var(--muted-2);opacity:.5}

/* ---------- trust strip ---------- */
.strip{border-block:1px solid var(--line);padding:1.4rem 0;margin-top:1rem}
.strip-in{display:flex;flex-wrap:wrap;gap:2rem 3rem;align-items:center;justify-content:center;color:var(--muted-2);font-size:.9rem}
.strip-in b{color:var(--text);font-family:'Space Grotesk';font-weight:700;font-size:1.15rem;margin-right:.4rem}

/* ---------- sections ---------- */
section.blk{padding:clamp(3.5rem,8vw,6rem) 0}
.sec-head{max-width:56ch;margin-bottom:3rem}
.sec-head h2{font-size:clamp(1.8rem,4vw,2.6rem);font-weight:700;margin-bottom:.9rem}
.sec-head p{color:var(--muted);font-size:1.08rem}

/* how it works — a real 3-step sequence */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;counter-reset:s}
@media(max-width:820px){.steps{grid-template-columns:1fr}}
.step{position:relative;padding:1.8rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--ink-2)}
.step .n{font-family:'Space Grotesk';font-weight:700;font-size:1rem;color:var(--ink);
  width:30px;height:30px;border-radius:8px;background:var(--teal);display:grid;place-items:center;margin-bottom:1rem}
.step h3{font-size:1.2rem;margin-bottom:.5rem}
.step p{color:var(--muted);font-size:.96rem}
.step:not(:last-child)::after{content:"";position:absolute;top:2.6rem;right:-.9rem;width:1.2rem;height:1px;background:var(--line-2)}
@media(max-width:820px){.step::after{display:none}}

/* features — varied sizes, not identical cards */
.feat{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem}
@media(max-width:900px){.feat{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.feat{grid-template-columns:1fr}}
.f{padding:1.5rem;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(180deg,var(--ink-2),transparent)}
.f.wide{grid-column:span 2}
@media(max-width:900px){.f.wide{grid-column:span 2}}
@media(max-width:560px){.f.wide{grid-column:span 1}}
.f .ic{width:38px;height:38px;border-radius:10px;background:rgba(52,224,196,.1);border:1px solid rgba(52,224,196,.25);
  display:grid;place-items:center;margin-bottom:.9rem}
.f .ic svg{width:20px;height:20px;color:var(--teal)}
.f h3{font-size:1.12rem;margin-bottom:.4rem}
.f p{color:var(--muted);font-size:.94rem}

/* ---------- pricing ---------- */
.price-top{display:flex;flex-direction:column;align-items:center;text-align:center;margin-bottom:2.4rem}
.toggle{display:inline-flex;background:var(--ink-2);border:1px solid var(--line);border-radius:999px;padding:.3rem;margin-top:1.4rem}
.toggle button{border:0;background:transparent;color:var(--muted);font-weight:600;font-size:.92rem;
  padding:.5rem 1.2rem;border-radius:999px;cursor:pointer;transition:.2s}
.toggle button.on{background:var(--teal);color:#032720}
.toggle .save{font-size:.72rem;color:var(--amber);margin-left:.35rem}
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:1.4rem;align-items:stretch}
@media(max-width:900px){.plans{grid-template-columns:1fr;max-width:420px;margin-inline:auto}}
.plan{display:flex;flex-direction:column;padding:2rem;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--ink-2);position:relative}
.plan.hot{border-color:var(--teal);box-shadow:var(--shadow-glow);background:linear-gradient(180deg,rgba(52,224,196,.06),var(--ink-2))}
.plan .badge{position:absolute;top:-11px;left:50%;transform:translateX(-50%);
  background:var(--teal);color:#032720;font-size:.72rem;font-weight:700;padding:.25rem .8rem;border-radius:999px}
.plan .pname{font-family:'Space Grotesk';font-weight:700;font-size:1.3rem;margin-bottom:.2rem}
.plan .ptag{color:var(--muted);font-size:.9rem;margin-bottom:1.2rem}
.plan .amt{display:flex;align-items:baseline;gap:.3rem;margin-bottom:.3rem}
.plan .amt .cur{color:var(--muted);font-size:1rem}
.plan .amt .val{font-family:'Space Grotesk';font-weight:700;font-size:2.6rem;letter-spacing:-.03em}
.plan .amt .per{color:var(--muted);font-size:.92rem}
.plan .sub{color:var(--muted-2);font-size:.85rem;min-height:1.2em;margin-bottom:1.4rem}
.plan ul{list-style:none;margin:0 0 1.6rem;display:grid;gap:.7rem}
.plan li{display:flex;gap:.6rem;font-size:.93rem;color:var(--text)}
.plan li svg{width:17px;height:17px;color:var(--teal);flex:none;margin-top:.15rem}
.plan .foot{margin-top:auto}

/* ---------- final cta ---------- */
.cta-band{position:relative;border:1px solid var(--line);border-radius:24px;overflow:hidden;
  padding:clamp(2.5rem,6vw,4rem);text-align:center;background:var(--ink-2)}
.cta-band::before{content:"";position:absolute;inset:0;z-index:0;
  background:radial-gradient(50% 120% at 50% 0%,rgba(52,224,196,.16),transparent 70%)}
.cta-band > *{position:relative;z-index:1}
.cta-band h2{font-size:clamp(1.8rem,4vw,2.6rem);margin-bottom:.8rem}
.cta-band p{color:var(--muted);max-width:48ch;margin:0 auto 1.8rem}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:2.5rem 0;margin-top:3rem;color:var(--muted-2);font-size:.9rem}
.foot-in{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1.5rem;align-items:center}
.foot-in a{color:var(--muted)}
.foot-in a:hover{color:var(--teal)}

/* ---------- auth pages ---------- */
.auth{min-height:100vh;display:grid;place-items:center;padding:2rem;position:relative;overflow:hidden}
.auth::before{content:"";position:absolute;inset:0;
  background:radial-gradient(50% 50% at 70% 20%,rgba(52,224,196,.14),transparent 70%),
            radial-gradient(50% 50% at 20% 90%,rgba(18,120,160,.16),transparent 70%)}
.card{position:relative;z-index:1;width:100%;max-width:420px;background:var(--ink-2);
  border:1px solid var(--line);border-radius:20px;padding:2.4rem}
.card h1{font-size:1.6rem;margin-bottom:.4rem}
.card .muted{color:var(--muted);font-size:.95rem;margin-bottom:1.8rem}
.field{margin-bottom:1.1rem}
.field label{display:block;font-size:.86rem;color:var(--muted);margin-bottom:.4rem;font-weight:500}
.field input,.field select{width:100%;padding:.8rem 1rem;border-radius:12px;background:var(--ink);
  border:1px solid var(--line-2);color:var(--text);font-size:.98rem;font-family:inherit}
.field input:focus,.field select:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 3px rgba(52,224,196,.15)}
.auth-alt{text-align:center;margin-top:1.4rem;color:var(--muted);font-size:.92rem}
.auth-alt a{color:var(--teal);font-weight:600}
.back{display:inline-flex;align-items:center;gap:.4rem;color:var(--muted);font-size:.9rem;margin-bottom:1.6rem}
.back:hover{color:var(--text)}
.note{background:rgba(52,224,196,.07);border:1px solid rgba(52,224,196,.2);border-radius:12px;
  padding:.8rem 1rem;font-size:.86rem;color:var(--muted);margin-bottom:1.4rem}